Two federal court cases challenging Environment Minister Murray Watt's approval of Woodside's North West Shelf gas project extension began hearings this week before Justice Catherine Button in Melbourne. The Australian Conservation Foundation (ACF) and Friends of Australian Rock Art (Fara) have filed separate but overlapping cases against the September 2025 ministerial approval, which allows the Karratha gas processing plant to operate until 2070 The Guardian.

The ACF estimates the extension would release approximately 4 billion tonnes of CO2 into the atmosphere — roughly equivalent to 10 years of Australia's annual emissions. The group's legal argument centers on the claim that Minister Watt failed to properly consider whether emissions from the gas plant could be a substantial cause of damage to Australia's protected environment. ACF also contends the minister lacked sufficient detail about the gas the plant would process, since operations would involve third-party gas from projects that have not yet been approved. In March 2026, ACF added a new legal ground to its case, though the specifics of that amendment have not been detailed in public reporting ACF.

Fara, a volunteer group formed around 2006 and co-convened by Judith Hugo OAM and Susan Swain, helped secure the national heritage listing of the Murujuga area in 2007. That listing created the legal trigger for assessing the North West Shelf project under federal environment laws. Fara's case argues that industrial emissions from the Karratha plant are already causing erosion of the Murujuga petroglyphs — ancient rock carvings — and that extending the project would worsen this damage. The Murujuga rock art complex contains more than a million petroglyphs dating back 50,000 years, including the oldest known image of a human face The Guardian.

Fara also argues the minister did not properly identify the risks to the Murujuga rock art from the project and is seeking details of meetings between Minister Watt and Woodside during negotiation of the approval conditions. The group's federal court hearing is scheduled for 21–27 July 2026 in Melbourne. Fara has also been active in the Western Australian Supreme Court, where an application was heard in late May 2026 to expand its landmark challenge FARA.

Both organizations argue in their respective cases that the minister incorrectly considered the claimed economic benefits of the gas plant.

A notable dimension of the proceedings is the participation of UN Special Rapporteur on the human right to a clean, healthy and sustainable environment, Astrid Puentes Riaño, who was granted leave to intervene as amicus curiae — a "friend of the court" who provides expertise without being a party to the case. The Federal Court accepted her application on 14 July 2026 ACF. Her intervention draws on the International Court of Justice's July 2025 ruling that a healthy environment is a human right and that states must prevent harm to the environment.

The broader context here is one of escalating legal friction between Australia's fossil fuel export infrastructure and its environmental and cultural heritage obligations. The ICJ advisory opinion, while non-binding, has given advocates a normative framework — a set of principles about what governments ought to do — that is increasingly cited in domestic litigation. The amicus intervention by a UN Special Rapporteur in an Australian federal court matter signals that domestic environmental approvals are being tested against emerging international human rights standards, not merely against the provisions of the Environment Protection and Biodiversity Conservation Act alone.

The cases also raise a procedural question that will matter beyond this dispute: whether environmental ministers can approve gas processing extensions where the feedstock gas comes from third-party projects that have not yet received their own approvals. If the court finds that Watt's decision was impermissibly speculative on this point, the precedent could constrain how future extensions are assessed when supply chains are not fully defined at the time of approval.

The intersection of climate accounting and cultural heritage protection is another fault line. ACF's emissions-based argument and Fara's petroglyph-erosion argument proceed on different legal theories, but both seek to establish that the minister's assessment was deficient. Should either succeed, the remedy would likely require a reconsideration of the approval with additional conditions or a broader scope of assessment, potentially delaying a project that Woodside expects to operate for over four more decades.

Fara's pursuit of meeting records between the minister and Woodside during condition negotiations adds a transparency dimension. If those communications are disclosed, they could illuminate the degree to which approval conditions were shaped through direct corporate engagement rather than purely through departmental assessment.

The outcomes of these cases, expected after the conclusion of hearings this week, will be closely watched by both the resources sector and environmental advocates. The resources sector sees the North West Shelf extension as critical infrastructure for maintaining Australia's LNG export capacity; environmental and heritage groups view it as a test of whether decades-long fossil fuel extensions can survive legal challenge when measured against both domestic heritage obligations and evolving international environmental norms.